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FtsZ polymers. (a) FtsZ protofilaments assembled with GTP. Monomeric FtsZ is also visible in the background (micrograph by L. Romberg). (b) FtsZ rings assembled with GDP (119). (c) Protofilament pairs and bundles assembled in reactions with GTP (96). (d) Large FtsZ bundles formed in the presence of ZipA and GTP (114). Bar is 50 nm in (a) and (b), 100 nm in (c) and (d). Images reprinted with permission.
